add missing includes
[project/fstools.git] / block.c
1 /*
2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU Lesser General Public License version 2.1
7  * as published by the Free Software Foundation
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  */
14
15 #define _GNU_SOURCE
16 #include <getopt.h>
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <syslog.h>
20 #include <libgen.h>
21 #include <glob.h>
22 #include <dirent.h>
23 #include <stdarg.h>
24 #include <string.h>
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <limits.h>
28
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <sys/swap.h>
32 #include <sys/mount.h>
33 #include <sys/wait.h>
34 #include <sys/sysmacros.h>
35
36 #include <linux/fs.h>
37
38 #include <uci.h>
39 #include <uci_blob.h>
40
41 #include <libubox/ulog.h>
42 #include <libubox/list.h>
43 #include <libubox/vlist.h>
44 #include <libubox/blobmsg_json.h>
45 #include <libubox/avl-cmp.h>
46
47 #include "probe.h"
48
49 #ifdef UBIFS_EXTROOT
50 #include "libubi/libubi.h"
51 #endif
52
53 enum {
54         TYPE_MOUNT,
55         TYPE_SWAP,
56 };
57
58 struct mount {
59         struct vlist_node node;
60         int type;
61
62         char *target;
63         char *path;
64         char *options;
65         uint32_t flags;
66         char *uuid;
67         char *label;
68         char *device;
69         int extroot;
70         int overlay;
71         int disabled_fsck;
72         unsigned int prio;
73 };
74
75 static struct vlist_tree mounts;
76 static struct blob_buf b;
77 static LIST_HEAD(devices);
78 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
79 static unsigned int delay_root;
80
81 enum {
82         CFG_ANON_MOUNT,
83         CFG_ANON_SWAP,
84         CFG_AUTO_MOUNT,
85         CFG_AUTO_SWAP,
86         CFG_DELAY_ROOT,
87         CFG_CHECK_FS,
88         __CFG_MAX
89 };
90
91 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
92         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
93         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
94         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
95         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
96         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
97         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
98 };
99
100 enum {
101         MOUNT_UUID,
102         MOUNT_LABEL,
103         MOUNT_ENABLE,
104         MOUNT_TARGET,
105         MOUNT_DEVICE,
106         MOUNT_OPTIONS,
107         __MOUNT_MAX
108 };
109
110 static const struct uci_blob_param_list config_attr_list = {
111         .n_params = __CFG_MAX,
112         .params = config_policy,
113 };
114
115 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
116         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
117         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
118         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
119         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
120         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
121         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
122 };
123
124 static const struct uci_blob_param_list mount_attr_list = {
125         .n_params = __MOUNT_MAX,
126         .params = mount_policy,
127 };
128
129 enum {
130         SWAP_ENABLE,
131         SWAP_UUID,
132         SWAP_LABEL,
133         SWAP_DEVICE,
134         SWAP_PRIO,
135         __SWAP_MAX
136 };
137
138 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
139         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
140         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
141         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
142         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
143         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
144 };
145
146 static const struct uci_blob_param_list swap_attr_list = {
147         .n_params = __SWAP_MAX,
148         .params = swap_policy,
149 };
150
151 struct mount_flag {
152         const char *name;
153         int32_t flag;
154 };
155
156 static const struct mount_flag mount_flags[] = {
157         { "sync",               MS_SYNCHRONOUS  },
158         { "async",              ~MS_SYNCHRONOUS },
159         { "dirsync",            MS_DIRSYNC      },
160         { "mand",               MS_MANDLOCK     },
161         { "nomand",             ~MS_MANDLOCK    },
162         { "atime",              ~MS_NOATIME     },
163         { "noatime",            MS_NOATIME      },
164         { "dev",                ~MS_NODEV       },
165         { "nodev",              MS_NODEV        },
166         { "diratime",           ~MS_NODIRATIME  },
167         { "nodiratime",         MS_NODIRATIME   },
168         { "exec",               ~MS_NOEXEC      },
169         { "noexec",             MS_NOEXEC       },
170         { "suid",               ~MS_NOSUID      },
171         { "nosuid",             MS_NOSUID       },
172         { "rw",                 ~MS_RDONLY      },
173         { "ro",                 MS_RDONLY       },
174         { "relatime",           MS_RELATIME     },
175         { "norelatime",         ~MS_RELATIME    },
176         { "strictatime",        MS_STRICTATIME  },
177         { "acl",                MS_POSIXACL     },
178         { "noacl",              ~MS_POSIXACL    },
179         { "nouser_xattr",       MS_NOUSER       },
180         { "user_xattr",         ~MS_NOUSER      },
181 };
182
183 static char *blobmsg_get_strdup(struct blob_attr *attr)
184 {
185         if (!attr)
186                 return NULL;
187
188         return strdup(blobmsg_get_string(attr));
189 }
190
191 static char *blobmsg_get_basename(struct blob_attr *attr)
192 {
193         if (!attr)
194                 return NULL;
195
196         return strdup(basename(blobmsg_get_string(attr)));
197 }
198
199 static void parse_mount_options(struct mount *m, char *optstr)
200 {
201         int i;
202         bool is_flag;
203         char *p, *opts, *last;
204
205         m->flags = 0;
206         m->options = NULL;
207
208         if (!optstr || !*optstr)
209                 return;
210
211         m->options = opts = calloc(1, strlen(optstr) + 1);
212
213         if (!m->options)
214                 return;
215
216         p = last = optstr;
217
218         do {
219                 p = strchr(p, ',');
220
221                 if (p)
222                         *p++ = 0;
223
224                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
225                         if (!strcmp(last, mount_flags[i].name)) {
226                                 if (mount_flags[i].flag < 0)
227                                         m->flags &= (uint32_t)mount_flags[i].flag;
228                                 else
229                                         m->flags |= (uint32_t)mount_flags[i].flag;
230                                 is_flag = true;
231                                 break;
232                         }
233                 }
234
235                 if (!is_flag)
236                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
237
238                 last = p;
239
240         } while (p);
241
242         free(optstr);
243 }
244
245 static int mount_add(struct uci_section *s)
246 {
247         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
248         struct mount *m;
249
250         blob_buf_init(&b, 0);
251         uci_to_blob(&b, s, &mount_attr_list);
252         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
253
254         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
255                 return -1;
256
257         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
258                 return -1;
259
260         m = malloc(sizeof(struct mount));
261         m->type = TYPE_MOUNT;
262         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
263         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
264         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
265         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
266
267         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
268
269         m->overlay = m->extroot = 0;
270         if (m->target && !strcmp(m->target, "/"))
271                 m->extroot = 1;
272         if (m->target && !strcmp(m->target, "/overlay"))
273                 m->extroot = m->overlay = 1;
274
275         if (m->target && *m->target != '/') {
276                 ULOG_WARN("ignoring mount section %s due to invalid target '%s'\n",
277                           s->e.name, m->target);
278                 free(m);
279                 return -1;
280         }
281
282         if (m->uuid)
283                 vlist_add(&mounts, &m->node, m->uuid);
284         else if (m->label)
285                 vlist_add(&mounts, &m->node, m->label);
286         else if (m->device)
287                 vlist_add(&mounts, &m->node, m->device);
288
289         return 0;
290 }
291
292 static int swap_add(struct uci_section *s)
293 {
294         struct blob_attr *tb[__SWAP_MAX] = { 0 };
295         struct mount *m;
296
297         blob_buf_init(&b, 0);
298         uci_to_blob(&b, s, &swap_attr_list);
299         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
300
301         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
302                 return -1;
303
304         m = malloc(sizeof(struct mount));
305         memset(m, 0, sizeof(struct mount));
306         m->type = TYPE_SWAP;
307         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
308         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
309         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
310         if (tb[SWAP_PRIO])
311                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
312         if (m->prio)
313                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
314
315         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
316                 /* store complete swap path */
317                 if (tb[SWAP_DEVICE])
318                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
319
320                 if (m->uuid)
321                         vlist_add(&mounts, &m->node, m->uuid);
322                 else if (m->label)
323                         vlist_add(&mounts, &m->node, m->label);
324                 else if (m->device)
325                         vlist_add(&mounts, &m->node, m->device);
326         }
327
328         return 0;
329 }
330
331 static int global_add(struct uci_section *s)
332 {
333         struct blob_attr *tb[__CFG_MAX] = { 0 };
334
335         blob_buf_init(&b, 0);
336         uci_to_blob(&b, s, &config_attr_list);
337         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
338
339         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
340                 anon_mount = 1;
341         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
342                 anon_swap = 1;
343
344         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
345                 auto_mount = 1;
346         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
347                 auto_swap = 1;
348
349         if (tb[CFG_DELAY_ROOT])
350                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
351
352         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
353                 check_fs = 1;
354
355         return 0;
356 }
357
358 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
359 {
360         struct mount *m;
361
362         vlist_for_each_element(&mounts, m, node) {
363                 if (m->type != TYPE_SWAP)
364                         continue;
365                 if (uuid && m->uuid && !strcasecmp(m->uuid, uuid))
366                         return m;
367                 if (label && m->label && !strcmp(m->label, label))
368                         return m;
369                 if (device && m->device && !strcmp(m->device, device))
370                         return m;
371         }
372
373         return NULL;
374 }
375
376 static struct mount* find_block(const char *uuid, const char *label, const char *device,
377                                 const char *target)
378 {
379         struct mount *m;
380
381         vlist_for_each_element(&mounts, m, node) {
382                 if (m->type != TYPE_MOUNT)
383                         continue;
384                 if (m->uuid && uuid && !strcasecmp(m->uuid, uuid))
385                         return m;
386                 if (m->label && label && !strcmp(m->label, label))
387                         return m;
388                 if (m->target && target && !strcmp(m->target, target))
389                         return m;
390                 if (m->device && device && !strcmp(m->device, device))
391                         return m;
392         }
393
394         return NULL;
395 }
396
397 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
398                           struct vlist_node *node_old)
399 {
400 }
401
402 static struct uci_package * config_try_load(struct uci_context *ctx, char *path)
403 {
404         char *file = basename(path);
405         char *dir = dirname(path);
406         char *err;
407         struct uci_package *pkg;
408
409         uci_set_confdir(ctx, dir);
410         ULOG_INFO("attempting to load %s/%s\n", dir, file);
411
412         if (uci_load(ctx, file, &pkg)) {
413                 uci_get_errorstr(ctx, &err, file);
414                 ULOG_ERR("unable to load configuration (%s)\n", err);
415
416                 free(err);
417                 return NULL;
418         }
419
420         return pkg;
421 }
422
423 static int config_load(char *cfg)
424 {
425         struct uci_context *ctx = uci_alloc_context();
426         struct uci_package *pkg = NULL;
427         struct uci_element *e;
428         char path[64];
429
430         vlist_init(&mounts, avl_strcmp, mounts_update);
431
432         if (cfg) {
433                 snprintf(path, sizeof(path), "%s/upper/etc/config/fstab", cfg);
434                 pkg = config_try_load(ctx, path);
435
436                 if (!pkg) {
437                         snprintf(path, sizeof(path), "%s/etc/config/fstab", cfg);
438                         pkg = config_try_load(ctx, path);
439                 }
440         }
441
442         if (!pkg) {
443                 snprintf(path, sizeof(path), "/etc/config/fstab");
444                 pkg = config_try_load(ctx, path);
445         }
446
447         if (!pkg) {
448                 ULOG_ERR("no usable configuration\n");
449                 return -1;
450         }
451
452         vlist_update(&mounts);
453         uci_foreach_element(&pkg->sections, e) {
454                 struct uci_section *s = uci_to_section(e);
455
456                 if (!strcmp(s->type, "mount"))
457                         mount_add(s);
458                 if (!strcmp(s->type, "swap"))
459                         swap_add(s);
460                 if (!strcmp(s->type, "global"))
461                         global_add(s);
462         }
463         vlist_flush(&mounts);
464
465         return 0;
466 }
467
468 static struct probe_info* _probe_path(char *path)
469 {
470         struct probe_info *pr;
471         char tmppath[64];
472
473         /* skip ubi device if ubiblock device is present */
474         if (path[5] == 'u' && path[6] == 'b' && path[7] == 'i' &&
475             path[8] >= '0' && path[8] <= '9' ) {
476                 snprintf(tmppath, sizeof(tmppath), "/dev/ubiblock%s", path + 8);
477                 list_for_each_entry(pr, &devices, list)
478                         if (!strcasecmp(pr->dev, tmppath))
479                                 return NULL;
480         }
481
482         return probe_path(path);
483 }
484
485 static int _cache_load(const char *path)
486 {
487         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
488         int j;
489         glob_t gl;
490
491         if (glob(path, gl_flags, NULL, &gl) < 0)
492                 return -1;
493
494         for (j = 0; j < gl.gl_pathc; j++) {
495                 struct probe_info *pr = _probe_path(gl.gl_pathv[j]);
496                 if (pr)
497                         list_add_tail(&pr->list, &devices);
498         }
499
500         globfree(&gl);
501
502         return 0;
503 }
504
505 static void cache_load(int mtd)
506 {
507         if (mtd) {
508                 _cache_load("/dev/mtdblock*");
509                 _cache_load("/dev/ubiblock*");
510                 _cache_load("/dev/ubi[0-9]*");
511         }
512         _cache_load("/dev/loop*");
513         _cache_load("/dev/mmcblk*");
514         _cache_load("/dev/sd*");
515         _cache_load("/dev/hd*");
516         _cache_load("/dev/md*");
517         _cache_load("/dev/vd*");
518         _cache_load("/dev/mapper/*");
519 }
520
521
522 static int print_block_uci(struct probe_info *pr)
523 {
524         if (!strcmp(pr->type, "swap")) {
525                 printf("config 'swap'\n");
526         } else {
527                 printf("config 'mount'\n");
528                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
529         }
530         if (pr->uuid)
531                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
532         else
533                 printf("\toption\tdevice\t'%s'\n", pr->dev);
534         printf("\toption\tenabled\t'0'\n\n");
535
536         return 0;
537 }
538
539 static struct probe_info* find_block_info(char *uuid, char *label, char *path)
540 {
541         struct probe_info *pr = NULL;
542
543         if (uuid)
544                 list_for_each_entry(pr, &devices, list)
545                         if (pr->uuid && !strcasecmp(pr->uuid, uuid))
546                                 return pr;
547
548         if (label)
549                 list_for_each_entry(pr, &devices, list)
550                         if (pr->label && !strcmp(pr->label, label))
551                                 return pr;
552
553         if (path)
554                 list_for_each_entry(pr, &devices, list)
555                         if (pr->dev && !strcmp(basename(pr->dev), basename(path)))
556                                 return pr;
557
558         return NULL;
559 }
560
561 static char* find_mount_point(char *block)
562 {
563         FILE *fp = fopen("/proc/self/mountinfo", "r");
564         static char line[256];
565         int len = strlen(block);
566         char *point = NULL, *pos, *tmp, *cpoint, *devname;
567         struct stat s;
568         int rstat;
569         unsigned int minor, major;
570
571         if (!fp)
572                 return NULL;
573
574         rstat = stat(block, &s);
575
576         while (fgets(line, sizeof(line), fp)) {
577                 pos = strchr(line, ' ');
578                 if (!pos)
579                         continue;
580
581                 pos = strchr(pos + 1, ' ');
582                 if (!pos)
583                         continue;
584
585                 tmp = ++pos;
586                 pos = strchr(pos, ':');
587                 if (!pos)
588                         continue;
589
590                 *pos = '\0';
591                 major = atoi(tmp);
592                 tmp = ++pos;
593                 pos = strchr(pos, ' ');
594                 if (!pos)
595                         continue;
596
597                 *pos = '\0';
598                 minor = atoi(tmp);
599                 pos = strchr(pos + 1, ' ');
600                 if (!pos)
601                         continue;
602                 tmp = ++pos;
603
604                 pos = strchr(pos, ' ');
605                 if (!pos)
606                         continue;
607                 *pos = '\0';
608                 cpoint = tmp;
609
610                 pos = strchr(pos + 1, ' ');
611                 if (!pos)
612                         continue;
613
614                 pos = strchr(pos + 1, ' ');
615                 if (!pos)
616                         continue;
617
618                 pos = strchr(pos + 1, ' ');
619                 if (!pos)
620                         continue;
621
622                 tmp = ++pos;
623                 pos = strchr(pos, ' ');
624                 if (!pos)
625                         continue;
626
627                 *pos = '\0';
628                 devname = tmp;
629                 if (!strncmp(block, devname, len)) {
630                         point = strdup(cpoint);
631                         break;
632                 }
633
634                 if (rstat)
635                         continue;
636
637                 if (!S_ISBLK(s.st_mode))
638                         continue;
639
640                 if (major == major(s.st_rdev) &&
641                     minor == minor(s.st_rdev)) {
642                         point = strdup(cpoint);
643                         break;
644                 }
645         }
646
647         fclose(fp);
648
649         return point;
650 }
651
652 static int print_block_info(struct probe_info *pr)
653 {
654         static char *mp;
655
656         mp = find_mount_point(pr->dev);
657         printf("%s:", pr->dev);
658         if (pr->uuid)
659                 printf(" UUID=\"%s\"", pr->uuid);
660
661         if (pr->label)
662                 printf(" LABEL=\"%s\"", pr->label);
663
664         if (pr->version)
665                 printf(" VERSION=\"%s\"", pr->version);
666
667         if (mp) {
668                 printf(" MOUNT=\"%s\"", mp);
669                 free(mp);
670         }
671
672         printf(" TYPE=\"%s\"\n", pr->type);
673
674         return 0;
675 }
676
677 static void mkdir_p(char *dir)
678 {
679         char *l = strrchr(dir, '/');
680
681         if (l) {
682                 *l = '\0';
683                 mkdir_p(dir);
684                 *l = '/';
685                 mkdir(dir, 0755);
686         }
687 }
688
689 static void check_filesystem(struct probe_info *pr)
690 {
691         pid_t pid;
692         struct stat statbuf;
693         const char *e2fsck = "/usr/sbin/e2fsck";
694         const char *f2fsck = "/usr/sbin/fsck.f2fs";
695         const char *dosfsck = "/usr/sbin/dosfsck";
696         const char *ckfs;
697
698         /* UBIFS does not need stuff like fsck */
699         if (!strncmp(pr->type, "ubifs", 5))
700                 return;
701
702         if (!strncmp(pr->type, "vfat", 4)) {
703                 ckfs = dosfsck;
704         } else if (!strncmp(pr->type, "f2fs", 4)) {
705                 ckfs = f2fsck;
706         } else if (!strncmp(pr->type, "ext", 3)) {
707                 ckfs = e2fsck;
708         } else {
709                 ULOG_ERR("check_filesystem: %s is not supported\n", pr->type);
710                 return;
711         }
712
713         if (stat(ckfs, &statbuf) < 0) {
714                 ULOG_ERR("check_filesystem: %s not found\n", ckfs);
715                 return;
716         }
717
718         pid = fork();
719         if (!pid) {
720                 if(!strncmp(pr->type, "f2fs", 4)) {
721                         execl(ckfs, ckfs, "-f", pr->dev, NULL);
722                         exit(-1);
723                 } else {
724                         execl(ckfs, ckfs, "-p", pr->dev, NULL);
725                         exit(-1);
726                 }
727         } else if (pid > 0) {
728                 int status;
729
730                 waitpid(pid, &status, 0);
731                 if (WEXITSTATUS(status))
732                         ULOG_ERR("check_filesystem: %s returned %d\n", ckfs, WEXITSTATUS(status));
733         }
734 }
735
736 static void handle_swapfiles(bool on)
737 {
738         struct stat s;
739         struct mount *m;
740         struct probe_info *pr;
741
742         vlist_for_each_element(&mounts, m, node)
743         {
744                 if (m->type != TYPE_SWAP || !m->target)
745                         continue;
746
747                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
748                         continue;
749
750                 pr = _probe_path(m->target);
751
752                 if (!pr)
753                         continue;
754
755                 if (!strcmp(pr->type, "swap")) {
756                         if (on)
757                                 swapon(pr->dev, m->prio);
758                         else
759                                 swapoff(pr->dev);
760                 }
761
762                 free(pr);
763         }
764 }
765
766 static void to_devnull(int fd)
767 {
768         int devnull = open("/dev/null", fd ? O_WRONLY : O_RDONLY);
769
770         if (devnull >= 0)
771                 dup2(devnull, fd);
772
773         if (devnull > STDERR_FILENO)
774                 close(devnull);
775 }
776
777 static int exec_mount(const char *source, const char *target,
778                       const char *fstype, const char *options)
779 {
780         pid_t pid;
781         struct stat s;
782         FILE *mount_fd;
783         int err, status, pfds[2];
784         char errmsg[128], cmd[sizeof("/sbin/mount.XXXXXXXXXXXXXXXX\0")];
785
786         snprintf(cmd, sizeof(cmd), "/sbin/mount.%s", fstype);
787
788         if (stat(cmd, &s) < 0 || !S_ISREG(s.st_mode) || !(s.st_mode & S_IXUSR)) {
789                 ULOG_ERR("No \"mount.%s\" utility available\n", fstype);
790                 return -1;
791         }
792
793         if (pipe(pfds) < 0)
794                 return -1;
795
796         fcntl(pfds[0], F_SETFD, fcntl(pfds[0], F_GETFD) | FD_CLOEXEC);
797         fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
798
799         pid = vfork();
800
801         switch (pid) {
802         case -1:
803                 close(pfds[0]);
804                 close(pfds[1]);
805
806                 return -1;
807
808         case 0:
809                 to_devnull(STDIN_FILENO);
810                 to_devnull(STDOUT_FILENO);
811
812                 dup2(pfds[1], STDERR_FILENO);
813                 close(pfds[0]);
814                 close(pfds[1]);
815
816                 if (options && *options)
817                         execl(cmd, cmd, "-o", options, source, target, NULL);
818                 else
819                         execl(cmd, cmd, source, target, NULL);
820
821                 return -1;
822
823         default:
824                 close(pfds[1]);
825
826                 mount_fd = fdopen(pfds[0], "r");
827
828                 while (fgets(errmsg, sizeof(errmsg), mount_fd))
829                         ULOG_ERR("mount.%s: %s", fstype, errmsg);
830
831                 fclose(mount_fd);
832
833                 err = waitpid(pid, &status, 0);
834
835                 if (err != -1) {
836                         if (status != 0) {
837                                 ULOG_ERR("mount.%s: failed with status %d\n", fstype, status);
838                                 errno = EINVAL;
839                                 err = -1;
840                         } else {
841                                 errno = 0;
842                                 err = 0;
843                         }
844                 }
845
846                 break;
847         }
848
849         return err;
850 }
851
852 static int handle_mount(const char *source, const char *target,
853                         const char *fstype, struct mount *m)
854 {
855         int i, err;
856         size_t mount_opts_len;
857         char *mount_opts = NULL, *ptr;
858
859         err = mount(source, target, fstype, m ? m->flags : 0,
860                     (m && m->options) ? m->options : "");
861
862         /* Requested file system type is not available in kernel,
863            attempt to call mount helper. */
864         if (err == -1 && errno == ENODEV) {
865                 if (m) {
866                         /* Convert mount flags back into string representation,
867                            first calculate needed length of string buffer... */
868                         mount_opts_len = 1 + (m->options ? strlen(m->options) : 0);
869
870                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
871                                 if ((mount_flags[i].flag > 0) &&
872                                     (mount_flags[i].flag < INT_MAX) &&
873                                     (m->flags & (uint32_t)mount_flags[i].flag))
874                                         mount_opts_len += strlen(mount_flags[i].name) + 1;
875
876                         /* ... then now allocate and fill it ... */
877                         ptr = mount_opts = calloc(1, mount_opts_len);
878
879                         if (!ptr) {
880                                 errno = ENOMEM;
881                                 return -1;
882                         }
883
884                         if (m->options)
885                                 ptr += sprintf(ptr, "%s,", m->options);
886
887                         for (i = 0; i < ARRAY_SIZE(mount_flags); i++)
888                                 if ((mount_flags[i].flag > 0) &&
889                                     (mount_flags[i].flag < INT_MAX) &&
890                                     (m->flags & (uint32_t)mount_flags[i].flag))
891                                         ptr += sprintf(ptr, "%s,", mount_flags[i].name);
892
893                         mount_opts[mount_opts_len - 1] = 0;
894                 }
895
896                 /* ... and now finally invoke the external mount program */
897                 err = exec_mount(source, target, fstype, mount_opts);
898         }
899
900         return err;
901 }
902
903 static int mount_device(struct probe_info *pr, int hotplug)
904 {
905         struct mount *m;
906         char *device;
907         char *mp;
908
909         if (!pr)
910                 return -1;
911
912         device = basename(pr->dev);
913
914         if (!strcmp(pr->type, "swap")) {
915                 if (hotplug && !auto_swap)
916                         return -1;
917                 m = find_swap(pr->uuid, pr->label, device);
918                 if (m || anon_swap)
919                         swapon(pr->dev, (m) ? (m->prio) : (0));
920
921                 return 0;
922         }
923
924         if (hotplug && !auto_mount)
925                 return -1;
926
927         mp = find_mount_point(pr->dev);
928         if (mp) {
929                 ULOG_ERR("%s is already mounted on %s\n", pr->dev, mp);
930                 free(mp);
931                 return -1;
932         }
933
934         m = find_block(pr->uuid, pr->label, device, NULL);
935         if (m && m->extroot)
936                 return -1;
937
938         if (m) {
939                 char *target = m->target;
940                 char _target[32];
941                 int err = 0;
942
943                 if (!target) {
944                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
945                         target = _target;
946                 }
947                 mkdir_p(target);
948
949                 if (check_fs)
950                         check_filesystem(pr);
951
952                 err = handle_mount(pr->dev, target, pr->type, m);
953                 if (err)
954                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
955                                  pr->dev, pr->type, target, errno, strerror(errno));
956                 else
957                         handle_swapfiles(true);
958                 return err;
959         }
960
961         if (anon_mount) {
962                 char target[32];
963                 int err = 0;
964
965                 snprintf(target, sizeof(target), "/mnt/%s", device);
966                 mkdir_p(target);
967
968                 if (check_fs)
969                         check_filesystem(pr);
970
971                 err = handle_mount(pr->dev, target, pr->type, NULL);
972                 if (err)
973                         ULOG_ERR("mounting %s (%s) as %s failed (%d) - %s\n",
974                                  pr->dev, pr->type, target, errno, strerror(errno));
975                 else
976                         handle_swapfiles(true);
977                 return err;
978         }
979
980         return 0;
981 }
982
983 static int umount_device(struct probe_info *pr)
984 {
985         struct mount *m;
986         char *device = basename(pr->dev);
987         char *mp;
988         int err;
989
990         if (!pr)
991                 return -1;
992
993         if (!strcmp(pr->type, "swap"))
994                 return -1;
995
996         mp = find_mount_point(pr->dev);
997         if (!mp)
998                 return -1;
999
1000         m = find_block(pr->uuid, pr->label, device, NULL);
1001         if (m && m->extroot)
1002                 return -1;
1003
1004         err = umount2(mp, MNT_DETACH);
1005         if (err)
1006                 ULOG_ERR("unmounting %s (%s)  failed (%d) - %s\n",
1007                          pr->dev, mp, errno, strerror(errno));
1008         else
1009                 ULOG_INFO("unmounted %s (%s)\n",
1010                           pr->dev, mp);
1011
1012         free(mp);
1013         return err;
1014 }
1015
1016 static int main_hotplug(int argc, char **argv)
1017 {
1018         char path[32];
1019         char *action, *device, *mount_point;
1020
1021         action = getenv("ACTION");
1022         device = getenv("DEVNAME");
1023
1024         if (!action || !device)
1025                 return -1;
1026         snprintf(path, sizeof(path), "/dev/%s", device);
1027
1028         if (!strcmp(action, "remove")) {
1029                 int err = 0;
1030                 mount_point = find_mount_point(path);
1031                 if (mount_point)
1032                         err = umount2(mount_point, MNT_DETACH);
1033
1034                 if (err)
1035                         ULOG_ERR("umount of %s failed (%d) - %s\n",
1036                                  mount_point, errno, strerror(errno));
1037
1038                 free(mount_point);
1039                 return 0;
1040         } else if (strcmp(action, "add")) {
1041                 ULOG_ERR("Unkown action %s\n", action);
1042
1043                 return -1;
1044         }
1045
1046         if (config_load(NULL))
1047                 return -1;
1048         cache_load(0);
1049
1050         return mount_device(find_block_info(NULL, NULL, path), 1);
1051 }
1052
1053 static int find_block_mtd(char *name, char *part, int plen)
1054 {
1055         FILE *fp = fopen("/proc/mtd", "r");
1056         static char line[256];
1057         char *index = NULL;
1058
1059         if(!fp)
1060                 return -1;
1061
1062         while (!index && fgets(line, sizeof(line), fp)) {
1063                 if (strstr(line, name)) {
1064                         char *eol = strstr(line, ":");
1065
1066                         if (!eol)
1067                                 continue;
1068
1069                         *eol = '\0';
1070                         index = &line[3];
1071                 }
1072         }
1073
1074         fclose(fp);
1075
1076         if (!index)
1077                 return -1;
1078
1079         snprintf(part, plen, "/dev/mtdblock%s", index);
1080
1081         return 0;
1082 }
1083
1084 #ifdef UBIFS_EXTROOT
1085 static int find_ubi_vol(libubi_t libubi, char *name, int *dev_num, int *vol_id)
1086 {
1087         int dev = 0;
1088
1089         while (ubi_dev_present(libubi, dev))
1090         {
1091                 struct ubi_dev_info dev_info;
1092                 struct ubi_vol_info vol_info;
1093
1094                 if (ubi_get_dev_info1(libubi, dev++, &dev_info))
1095                         continue;
1096                 if (ubi_get_vol_info1_nm(libubi, dev_info.dev_num, name, &vol_info))
1097                         continue;
1098
1099                 *dev_num = dev_info.dev_num;
1100                 *vol_id = vol_info.vol_id;
1101
1102                 return 0;
1103         }
1104
1105         return -1;
1106 }
1107
1108 static int find_block_ubi(libubi_t libubi, char *name, char *part, int plen)
1109 {
1110         int dev_num;
1111         int vol_id;
1112         int err = -1;
1113
1114         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1115         if (!err)
1116                 snprintf(part, plen, "/dev/ubi%d_%d", dev_num, vol_id);
1117
1118         return err;
1119 }
1120
1121 static int find_block_ubi_RO(libubi_t libubi, char *name, char *part, int plen)
1122 {
1123         int dev_num;
1124         int vol_id;
1125         int err = -1;
1126
1127         err = find_ubi_vol(libubi, name, &dev_num, &vol_id);
1128         if (!err)
1129                 snprintf(part, plen, "/dev/ubiblock%d_%d", dev_num, vol_id);
1130
1131         return err;
1132 }
1133
1134 #else
1135
1136 static int find_root_dev(char *buf, int len)
1137 {
1138         DIR *d;
1139         dev_t root;
1140         struct stat s;
1141         struct dirent *e;
1142
1143         if (stat("/", &s))
1144                 return -1;
1145
1146         if (!(d = opendir("/dev")))
1147                 return -1;
1148
1149         root = s.st_dev;
1150
1151         while ((e = readdir(d)) != NULL) {
1152                 snprintf(buf, len, "/dev/%s", e->d_name);
1153
1154                 if (stat(buf, &s) || s.st_rdev != root)
1155                         continue;
1156
1157                 closedir(d);
1158                 return 0;
1159         }
1160
1161         closedir(d);
1162         return -1;
1163 }
1164
1165 #endif
1166
1167 static int test_fs_support(const char *name)
1168 {
1169         char line[128], *p;
1170         int rv = -1;
1171         FILE *f;
1172
1173         if ((f = fopen("/proc/filesystems", "r")) != NULL) {
1174                 while (fgets(line, sizeof(line), f)) {
1175                         p = strtok(line, "\t\n");
1176
1177                         if (p && !strcmp(p, "nodev"))
1178                                 p = strtok(NULL, "\t\n");
1179
1180                         if (p && !strcmp(p, name)) {
1181                                 rv = 0;
1182                                 break;
1183                         }
1184                 }
1185                 fclose(f);
1186         }
1187
1188         return rv;
1189 }
1190
1191 static int check_extroot(char *path)
1192 {
1193         struct probe_info *pr = NULL;
1194         char devpath[32];
1195
1196 #ifdef UBIFS_EXTROOT
1197         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1198                 int err = -1;
1199                 libubi_t libubi;
1200
1201                 libubi = libubi_open();
1202                 err = find_block_ubi_RO(libubi, "rootfs", devpath, sizeof(devpath));
1203                 libubi_close(libubi);
1204                 if (err)
1205                         return -1;
1206         }
1207 #else
1208         if (find_block_mtd("\"rootfs\"", devpath, sizeof(devpath))) {
1209                 if (find_root_dev(devpath, sizeof(devpath))) {
1210                         ULOG_ERR("extroot: unable to determine root device\n");
1211                         return -1;
1212                 }
1213         }
1214 #endif
1215
1216         list_for_each_entry(pr, &devices, list) {
1217                 if (!strcmp(pr->dev, devpath)) {
1218                         struct stat s;
1219                         FILE *fp = NULL;
1220                         char tag[64];
1221                         char uuid[64] = { 0 };
1222
1223                         snprintf(tag, sizeof(tag), "%s/etc", path);
1224                         if (stat(tag, &s))
1225                                 mkdir_p(tag);
1226
1227                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
1228                         if (stat(tag, &s)) {
1229                                 fp = fopen(tag, "w+");
1230                                 if (!fp) {
1231                                         ULOG_ERR("extroot: failed to write UUID to %s: %d (%s)\n",
1232                                                  tag, errno, strerror(errno));
1233                                         /* return 0 to continue boot regardless of error */
1234                                         return 0;
1235                                 }
1236                                 fputs(pr->uuid, fp);
1237                                 fclose(fp);
1238                                 return 0;
1239                         }
1240
1241                         fp = fopen(tag, "r");
1242                         if (!fp) {
1243                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1244                                          tag, errno, strerror(errno));
1245                                 return -1;
1246                         }
1247
1248                         if (!fgets(uuid, sizeof(uuid), fp))
1249                                 ULOG_ERR("extroot: failed to read UUID from %s: %d (%s)\n",
1250                                          tag, errno, strerror(errno));
1251                         fclose(fp);
1252
1253                         if (*uuid && !strcasecmp(uuid, pr->uuid))
1254                                 return 0;
1255
1256                         ULOG_ERR("extroot: UUID mismatch (root: %s, %s: %s)\n",
1257                                  pr->uuid, basename(path), uuid);
1258                         return -1;
1259                 }
1260         }
1261
1262         ULOG_ERR("extroot: unable to lookup root device %s\n", devpath);
1263         return -1;
1264 }
1265
1266 /*
1267  * Read info about extroot from UCI (using prefix) and mount it.
1268  */
1269 static int mount_extroot(char *cfg)
1270 {
1271         char overlay[] = "/tmp/extroot/overlay";
1272         char mnt[] = "/tmp/extroot/mnt";
1273         char *path = mnt;
1274         struct probe_info *pr;
1275         struct mount *m;
1276         int err = -1;
1277
1278         /* Load @cfg/etc/config/fstab */
1279         if (config_load(cfg))
1280                 return -2;
1281
1282         /* See if there is extroot-specific mount config */
1283         m = find_block(NULL, NULL, NULL, "/");
1284         if (!m)
1285                 m = find_block(NULL, NULL, NULL, "/overlay");
1286
1287         if (!m || !m->extroot)
1288         {
1289                 ULOG_INFO("extroot: not configured\n");
1290                 return -1;
1291         }
1292
1293         /* Find block device pointed by the mount config */
1294         pr = find_block_info(m->uuid, m->label, m->device);
1295
1296         if (!pr && delay_root){
1297                 ULOG_INFO("extroot: device not present, retrying in %u seconds\n", delay_root);
1298                 sleep(delay_root);
1299                 make_devs();
1300                 cache_load(0);
1301                 pr = find_block_info(m->uuid, m->label, m->device);
1302         }
1303         if (pr) {
1304                 if (strncmp(pr->type, "ext", 3) &&
1305                     strncmp(pr->type, "f2fs", 4) &&
1306                     strncmp(pr->type, "ubifs", 5)) {
1307                         ULOG_ERR("extroot: unsupported filesystem %s, try ext4, f2fs or ubifs\n", pr->type);
1308                         return -1;
1309                 }
1310
1311                 if (test_fs_support(pr->type)) {
1312                         ULOG_ERR("extroot: filesystem %s not supported by kernel\n", pr->type);
1313                         return -1;
1314                 }
1315
1316                 if (m->overlay)
1317                         path = overlay;
1318                 mkdir_p(path);
1319
1320                 if (check_fs)
1321                         check_filesystem(pr);
1322
1323                 err = mount(pr->dev, path, pr->type, m->flags,
1324                             (m->options) ? (m->options) : (""));
1325
1326                 if (err) {
1327                         ULOG_ERR("extroot: mounting %s (%s) on %s failed: %d (%s)\n",
1328                                  pr->dev, pr->type, path, errno, strerror(errno));
1329                 } else if (m->overlay) {
1330                         err = check_extroot(path);
1331                         if (err)
1332                                 umount(path);
1333                 }
1334         } else {
1335                 ULOG_ERR("extroot: cannot find device %s%s\n",
1336                          (m->uuid ? "with UUID " : (m->label ? "with label " : "")),
1337                          (m->uuid ? m->uuid : (m->label ? m->label : m->device)));
1338         }
1339
1340         return err;
1341 }
1342
1343 static int main_extroot(int argc, char **argv)
1344 {
1345         struct probe_info *pr;
1346         char blkdev_path[32] = { 0 };
1347         int err = -1;
1348 #ifdef UBIFS_EXTROOT
1349         libubi_t libubi;
1350 #endif
1351
1352         if (!getenv("PREINIT"))
1353                 return -1;
1354
1355         if (argc != 2) {
1356                 ULOG_ERR("Usage: block extroot\n");
1357                 return -1;
1358         }
1359
1360         make_devs();
1361         cache_load(1);
1362
1363         /* enable LOG_INFO messages */
1364         ulog_threshold(LOG_INFO);
1365
1366         /*
1367          * Look for "rootfs_data". We will want to mount it and check for
1368          * extroot configuration.
1369          */
1370
1371         /* Start with looking for MTD partition */
1372         find_block_mtd("\"rootfs_data\"", blkdev_path, sizeof(blkdev_path));
1373         if (blkdev_path[0]) {
1374                 pr = find_block_info(NULL, NULL, blkdev_path);
1375                 if (pr && !strcmp(pr->type, "jffs2")) {
1376                         char cfg[] = "/tmp/jffs_cfg";
1377
1378                         /*
1379                          * Mount MTD part and try extroot (using
1380                          * /etc/config/fstab from that partition)
1381                          */
1382                         mkdir_p(cfg);
1383                         if (!mount(blkdev_path, cfg, "jffs2", MS_NOATIME, NULL)) {
1384                                 err = mount_extroot(cfg);
1385                                 umount2(cfg, MNT_DETACH);
1386                         }
1387                         if (err < 0)
1388                                 rmdir("/tmp/overlay");
1389                         rmdir(cfg);
1390                         return err;
1391                 }
1392         }
1393
1394 #ifdef UBIFS_EXTROOT
1395         /* ... but it also could be an UBI volume */
1396         memset(blkdev_path, 0, sizeof(blkdev_path));
1397         libubi = libubi_open();
1398         find_block_ubi(libubi, "rootfs_data", blkdev_path, sizeof(blkdev_path));
1399         libubi_close(libubi);
1400         if (blkdev_path[0]) {
1401                 char cfg[] = "/tmp/ubifs_cfg";
1402
1403                 /* Mount volume and try extroot (using fstab from that vol) */
1404                 mkdir_p(cfg);
1405                 if (!mount(blkdev_path, cfg, "ubifs", MS_NOATIME, NULL)) {
1406                         err = mount_extroot(cfg);
1407                         umount2(cfg, MNT_DETACH);
1408                 }
1409                 if (err < 0)
1410                         rmdir("/tmp/overlay");
1411                 rmdir(cfg);
1412                 return err;
1413        }
1414 #endif
1415
1416         return mount_extroot(NULL);
1417 }
1418
1419 static int main_mount(int argc, char **argv)
1420 {
1421         struct probe_info *pr;
1422
1423         if (config_load(NULL))
1424                 return -1;
1425
1426         cache_load(1);
1427         list_for_each_entry(pr, &devices, list)
1428                 mount_device(pr, 0);
1429
1430         handle_swapfiles(true);
1431
1432         return 0;
1433 }
1434
1435 static int main_umount(int argc, char **argv)
1436 {
1437         struct probe_info *pr;
1438
1439         if (config_load(NULL))
1440                 return -1;
1441
1442         handle_swapfiles(false);
1443
1444         cache_load(0);
1445         list_for_each_entry(pr, &devices, list)
1446                 umount_device(pr);
1447
1448         return 0;
1449 }
1450
1451 static int main_detect(int argc, char **argv)
1452 {
1453         struct probe_info *pr;
1454
1455         cache_load(0);
1456         printf("config 'global'\n");
1457         printf("\toption\tanon_swap\t'0'\n");
1458         printf("\toption\tanon_mount\t'0'\n");
1459         printf("\toption\tauto_swap\t'1'\n");
1460         printf("\toption\tauto_mount\t'1'\n");
1461         printf("\toption\tdelay_root\t'5'\n");
1462         printf("\toption\tcheck_fs\t'0'\n\n");
1463         list_for_each_entry(pr, &devices, list)
1464                 print_block_uci(pr);
1465
1466         return 0;
1467 }
1468
1469 static int main_info(int argc, char **argv)
1470 {
1471         int i;
1472         struct probe_info *pr;
1473
1474         cache_load(1);
1475         if (argc == 2) {
1476                 list_for_each_entry(pr, &devices, list)
1477                         print_block_info(pr);
1478
1479                 return 0;
1480         };
1481
1482         for (i = 2; i < argc; i++) {
1483                 struct stat s;
1484
1485                 if (stat(argv[i], &s)) {
1486                         ULOG_ERR("failed to stat %s\n", argv[i]);
1487                         continue;
1488                 }
1489                 if (!S_ISBLK(s.st_mode) && !(S_ISCHR(s.st_mode) && major(s.st_rdev) == 250)) {
1490                         ULOG_ERR("%s is not a block device\n", argv[i]);
1491                         continue;
1492                 }
1493                 pr = find_block_info(NULL, NULL, argv[i]);
1494                 if (pr)
1495                         print_block_info(pr);
1496         }
1497
1498         return 0;
1499 }
1500
1501 static int swapon_usage(void)
1502 {
1503         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1504                 "\tStart swapping on [DEVICE]\n"
1505                 " -a\tStart swapping on all swap devices\n"
1506                 " -p pri\tSet priority of swap device\n"
1507                 " -s\tShow summary\n");
1508         return -1;
1509 }
1510
1511 static int main_swapon(int argc, char **argv)
1512 {
1513         int ch;
1514         FILE *fp;
1515         char *lineptr;
1516         size_t s;
1517         struct probe_info *pr;
1518         int flags = 0;
1519         int pri;
1520         struct stat st;
1521         int err;
1522
1523         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1524                 switch(ch) {
1525                 case 's':
1526                         fp = fopen("/proc/swaps", "r");
1527                         lineptr = NULL;
1528
1529                         if (!fp) {
1530                                 ULOG_ERR("failed to open /proc/swaps\n");
1531                                 return -1;
1532                         }
1533                         while (getline(&lineptr, &s, fp) > 0)
1534                                 printf("%s", lineptr);
1535                         if (lineptr)
1536                                 free(lineptr);
1537                         fclose(fp);
1538                         return 0;
1539                 case 'a':
1540                         cache_load(0);
1541                         list_for_each_entry(pr, &devices, list) {
1542                                 if (strcmp(pr->type, "swap"))
1543                                         continue;
1544                                 if (swapon(pr->dev, 0))
1545                                         ULOG_ERR("failed to swapon %s\n", pr->dev);
1546                         }
1547                         return 0;
1548                 case 'p':
1549                         pri = atoi(optarg);
1550                         if (pri >= 0)
1551                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1552                         break;
1553                 default:
1554                         return swapon_usage();
1555                 }
1556
1557         }
1558
1559         if (optind != (argc - 1))
1560                 return swapon_usage();
1561
1562         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1563                 ULOG_ERR("%s is not a block device or file\n", argv[optind]);
1564                 return -1;
1565         }
1566         err = swapon(argv[optind], flags);
1567         if (err) {
1568                 ULOG_ERR("failed to swapon %s (%d)\n", argv[optind], err);
1569                 return err;
1570         }
1571
1572         return 0;
1573 }
1574
1575 static int main_swapoff(int argc, char **argv)
1576 {
1577         if (argc != 2) {
1578                 ULOG_ERR("Usage: swapoff [-a] [DEVICE]\n\n"
1579                         "\tStop swapping on DEVICE\n"
1580                         " -a\tStop swapping on all swap devices\n");
1581                 return -1;
1582         }
1583
1584         if (!strcmp(argv[1], "-a")) {
1585                 FILE *fp = fopen("/proc/swaps", "r");
1586                 char line[256];
1587
1588                 if (!fp) {
1589                         ULOG_ERR("failed to open /proc/swaps\n");
1590                         return -1;
1591                 }
1592                 if (fgets(line, sizeof(line), fp))
1593                         while (fgets(line, sizeof(line), fp)) {
1594                                 char *end = strchr(line, ' ');
1595                                 int err;
1596
1597                                 if (!end)
1598                                         continue;
1599                                 *end = '\0';
1600                                 err = swapoff(line);
1601                                 if (err)
1602                                         ULOG_ERR("failed to swapoff %s (%d)\n", line, err);
1603                         }
1604                 fclose(fp);
1605         } else {
1606                 struct stat s;
1607                 int err;
1608
1609                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1610                         ULOG_ERR("%s is not a block device or file\n", argv[1]);
1611                         return -1;
1612                 }
1613                 err = swapoff(argv[1]);
1614                 if (err) {
1615                         ULOG_ERR("failed to swapoff %s (%d)\n", argv[1], err);
1616                         return err;
1617                 }
1618         }
1619
1620         return 0;
1621 }
1622
1623 int main(int argc, char **argv)
1624 {
1625         char *base = basename(*argv);
1626
1627         umask(0);
1628
1629         ulog_open(-1, -1, "block");
1630         ulog_threshold(LOG_NOTICE);
1631
1632         if (!strcmp(base, "swapon"))
1633                 return main_swapon(argc, argv);
1634
1635         if (!strcmp(base, "swapoff"))
1636                 return main_swapoff(argc, argv);
1637
1638         if ((argc > 1) && !strcmp(base, "block")) {
1639                 if (!strcmp(argv[1], "info"))
1640                         return main_info(argc, argv);
1641
1642                 if (!strcmp(argv[1], "detect"))
1643                         return main_detect(argc, argv);
1644
1645                 if (!strcmp(argv[1], "hotplug"))
1646                         return main_hotplug(argc, argv);
1647
1648                 if (!strcmp(argv[1], "extroot"))
1649                         return main_extroot(argc, argv);
1650
1651                 if (!strcmp(argv[1], "mount"))
1652                         return main_mount(argc, argv);
1653
1654                 if (!strcmp(argv[1], "umount"))
1655                         return main_umount(argc, argv);
1656
1657                 if (!strcmp(argv[1], "remount")) {
1658                         int ret = main_umount(argc, argv);
1659
1660                         if (!ret)
1661                                 ret = main_mount(argc, argv);
1662                         return ret;
1663                 }
1664         }
1665
1666         ULOG_ERR("Usage: block <info|mount|umount|detect>\n");
1667
1668         return -1;
1669 }